Pokeballs wasted when PC & party is full?

ItemHandlers::BattleUseOnBattler.addIf(proc{|item|
                pbIsPokeBall?(item)},proc{|item,battler,scene|  # Any Poké Ball
   battle=battler.battle
   if battler.pbOpposing1.hp>0 && battler.pbOpposing2.hp>0
     if !pbIsSnagBall?(item)
       scene.pbDisplay(_INTL("It's no good!  It's impossible to aim when there are two Pokémon!"))
       return false
     end
   end
	 #KVAGRAM-EDIT--START--
	 if battle.pbPlayer.party.length>=6
		msu_count = $PokemonStorage.getMSUspace
		if (msu_count == 0)
			scene.pbDisplay(_INTL("The MSU is full, it can not hold any more!"))
			scene.pbDisplay(_INTL("You need to empty the MSU in a pokemon-bank."))
			return false
		elsif(msu_count < 0)
			scene.pbDisplay(_INTL("You cannot hold more than 6 pokemon."))
			scene.pbDisplay(_INTL("If only there was a way to hold more."))
			return false
		end
	 end
	 #KVAGRAM-EDIT----END--
	 #old code - kept for documentaion:
   #if battle.pbPlayer.party.length>=6 && $PokemonStorage.full?
   #  scene.pbDisplay(_INTL("There is no room left in the PC!"))
   #  return false
   #end
   return true
})